Cookie solution overhaul

Problem/Motivation

Iubenda has updated its Cookie Solution a while ago: https://www.iubenda.com/en/help/1205-how-to-configure-your-cookie-soluti...
All the config and options provided with the new version of the script must be ported inside the module.

Data model changes

Iubenda Callbacks will have to be put inside a javascript file by populating the global variable Drupal.iubCallbacks:

(function ($) {
  Drupal.iubCallbacks = Drupal.iubCallbacks || {};
  Drupal.iubCallbacks.onReady = function (e) {
    console.log("do something crazy");
  }
})(jQuery);